Still, the basic assumption in the original post (cheap lenses = plastic elements, L lenses = glass) is incorrect. The clear lenses on these Tom Ford glasses are enhanced by a blue coating to reduce blue light exposure. Glass is normally chosen as it is scratch resistant and has the greatest clarity. t_r|5, Jan 3, 2007 #1. anthony_bez. Creators use a mold to construct the lenses in much the same way regular plastic lenses for glasses are made. Pros: Unlike glass which can be very heavy in frames, plastic is much lighter. Well then they are out to con you! Polycarbonate Lenses That being said, if you drop your glass lenses, they will break, whereas a plastic lens will just scratch. It’s for the strongest prescription and only suitable for full rimmed glasses. The higher the refractive index, the thinner the glass. Plastic lenses are nearly 60% lighter than glass, and with the thin design of high index lenses, the difference in weight will make a big difference in the comfort of your glasses. While they’re not the thinnest kind of lens out there, they still retain their position as the swiss-army-knife of eyewear lenses. That’s what glasses do. If you have narrowed the search for your next pair of glasses to either acetate or plastic, then it’s time to turn your attention to your lens choices. When it comes to lenses, you’ve got options: tinting, mirror coating, gradient, transition, polarized or non-polarized, and, of course — lens material. That’s how your eye focuses light on the retina. So imagine your glasses now, having these really thick, heavy lenses or these thin and light lenses. The newest debate, glass vs plastic, has struck people's curiosity as to which one is better for the environment. They are more than 10-times more impact resistant than your average plastic or glass lens. I … But my recommendation of the 18-70mm kit lens stands. Both the varieties have their own benefits and features. Refractive index refers to the rate at which light bends as it passes through the plastic of the lens. Glass lenses can be custom designed as well, but that process can be expensive and put to risk the strength of the glass itself. Sunglasses Lenses If shopping for sunglasses, then the lens options usually come down to regular non-polarized, polarized, or mirrored lenses. Contact lenses are thin discs of plastic or glass that sit directly on your eye to correct vision. 2) Check the Temperature. No they clearly said plastic or glass lenses, and it was I believe they wanted to charge $400 more for the glass ones. It is a bargain when purchased with the camera. Polycarbonate allows manufacturers to take advantage of the material’s flexibility and low production cost. Costa Del Mar has two structural varieties- plastic and glass. Glass vs. plastic lenses: a quick comparison. Polycarbonate lenses are ultra-durable, ultra-lightweight lenses. Plastic vs. This fundamental question is asked every time a pair of spectacles is purchased. Both polycarbonate and Trivex lenses are thinner and lighter than regular plastic lenses. So many variables play into the equation that, unless you’re an expert, you often don’t know what to choose in order to maximize your opportunities and get exactly what you want and need. COST: Glass lenses are generally less expensive than comparable plastics. This makes it easier to fit plastic lenses in all types of frames (full, semi/supra or rimless). CR-39 is heated and poured into optical quality glass moulds – adapting the qualities of glass very closely. Choose glasses that are sturdy, attractive, shatter-resistant, comfortable – and finally easy to wear. They may charge you to handle this, and it ultimately means a trip to the eyeglass store after all. Today's eyeglass frames are made from many types of plastic and metal. Buying Glasses Online vs. In-Store Plastic or glass lenses? And we have shown before in our clear filter tests, if one uses high quality glass in front of a filter, there is no impact on the lens’ resolving power.So it looks like if one uses glass filters similar to the ones from NiSi, one can get maximum sharpness from the camera + lens setup. It’s incredibly thin which offers superior aesthetic appeal. So you put on those focal plane changing clear plastic lenses and bam, myopia symptom is gone. Plastic high index lenses are extremely lightweight. They give good UV protection and are the first choice for rimless or semi-rimless frames to avoid chipping, but their visual quality can be not as good as other lenses because some polycarbonate lenses they can produce a rainbow effect in the peripheral vision. For some clarity on which lens material is best for you, let’s have a little face-off between the generations-old glass and the (relatively) young upstart polycarbonate. Plastic high index lenses are resistant to shattering and cannot splinter. Move focal plane. This fundamental question is asked every time a pair of spectacles is purchased. I'm intrigued by the exclusivity of this offer and getting the thinnest available lenses in the world, but also wary that this is going to cost me an arm and a leg. High-index plastic lenses have a refractive index between 1.6 and 1.74; the index of ordinary plastic and polycarbonate lenses is … Canon does utilize molded plastic aspherical lens elements in some lenses. The CR stands for “Columbia Resin” which is the polymer that the material is made out of and the 39 means that there were 38 other “Columbia Resin’s” that didn’t make the cut for optical lenses. Bifocal Lenses. They also offer 100 percent protection from the sun's harmful UV light and are up to 10 times more impact-resistant than plastic or glass lenses. They also use some uv hardened resin layers on some. Half as heavy as glass, far less likely to shatter, and optical quality nearly as good as glass. Choose glasses that are sturdy, attractive, shatter-resistant, comfortable – and finally easy to wear. plastic lenses are softer and easy to be scratched. However, thinner lenses won’t necessarily mean they will weigh less. 1.80 High-index Lens – Glass Lenses. Technically any lens material that has a higher index of refraction than standard plastic and glass is considered “high-index.” RELATED: Best Anti-Fog For Your Prescription Lenses. So, let us have a detailed look on these aspects. Plastic vs Glass lenses. The following holds true for both materials: Choosing the most suitable one hinges on individual factors such as visual acuity and personal taste. Rimless or semi rimless frames would not be able to support glass lenses due to its weight. Glass lenses will scratch less than plastic lenses. With all things equal, polycarbonate is up to 18% lighter than high-index. As you can see, there is no difference between using a lens with or without a glass filter. With the launch of the Quest 2, many players will be experiencing the wonderful world of VR for the first time.The Quest 2 is the most accessible headset yet with a simple, intuitive setup process and a cable-free experience, but for visually impaired players like myself, the oculus There is no diopter adjuster on the Quest, so you'll need either wear glasses, contacts, or attach lens adapters. If the sound is clear and high-pitched, the lenses are most likely glass, but could possibly be very hard plastic. Plastic Lenses (CR-39) Plastic lenses or also known as CR-39 is the most common optical lens material you will find. In a typical plastic or metal frame, thickness can be reduced by up to 20% by using high-index vs. polycarbonate lenses. Glasses ordered online will often need to be adjusted by an optical professional anyway. Do they both recycle well? So high-index plastic lenses are thinner than the polycarbonate lenses and also lightweight. When eye safety is a concern, polycarbonate or Trivex lenses usually are the best choice for your eyeglasses, sunglasses and sports eyewear.. Those statements are not accurate. These lenses correct both near- and long-distance vision by combining two prescriptions into a single lens. Cheap lenses use glass too (though may include some plastic elements). Here is a brief comparison of glass vs. plastic lenses to help you decide which option is best for you: WEIGHT: Plastic is about half the weight of glass, so plastic lenses are a more comfortable choice for long-term wear. Standard plastic lenses have an index of refraction of 1.50, and glass lenses have an index of refraction of 1.52. Your acrylic or glass lenses will be fitted within the frame and reflect light and allow it to pass through the lens. The upper part of the lens is designed to correct distance deficiencies, while the bottom portion is a near-distance lens meant to correct up-close vision. The glass sphera (falco or something?) Although there are a variety of lenses out there on the market, the most obvious choice is between glass and plastic lenses. Very nice! Prescription accuracy, durability of the lenses, and fit can all be potential issues of buying your glasses online. The high-index 1.60 lenses are recommended for prescriptions between -3.00 to -5.50. Magnifying glasses use a convex-shaped lens that curves outward near the center. Or you can compare the price, plastic lenses are more expensive. Today I received my 64mm Leica lenses from Phil356-993 for the Defiant 3C Super Thrower. Glass lenses are the traditional ones, having been used for some time now, while plastic lenses are relatively newer. A simple list of pros and cons and help you decide. The following holds true for both materials: Choosing the most suitable one hinges on individual factors such as visual acuity and personal taste. has a flat lens, then little 'side shields', whereas the plastic sphera has a curved lens, which feels nicer to wear (to me), however will distort your peripheral vision. Bifocal lenses are the most common type of multifocal lens. If you want to know more about myopia causes (and how glasses in general are a bit of a quick fix and kind of stupid), then look at this myopia primer. Trivex lenses are made from a lightweight, impact-resistant material. And if you actually compare the two you can actually see that the plastic on the right compared to the polycarbonate on my left is about 25-30% thicker with the same exact prescription. Glass lenses can also be very heavy in comparison to plastic lenses. Shopping for eyeglasses can be complex. This is somebody who has a -5.00 prescription. Many people are unsure whether it is better to use glass or plastic. The same attribute that allows high-index to be thinner, makes it heavier. Coated Glass . Most lenses in glasses today are made of CR-39 plastic, or very … It was developed in 2001 by PPG Industries as an alternative to polycarbonate. Is one more toxic than the other? Hold the glasses by two fingers on one earpiece so as not to interfere with resonance and gently tap one of the lenses. Plastic. Plastic lens are more lighter than glass lenses, but more thicker, especially for high myopia. Some frames combine materials—for example, a frame with plastic surrounding the lenses and temple pieces made from titanium. Lens Comparison: Uncoated Glass vs. There are two types -- soft and hard, also called rigid glass permeable. Since plastic is recommended only till 1.74, 1.80 high index glasses are available in glass material. This helps to enhance the magnification and the viewing area that you are working with. Plastic or glass lenses? Made of acetate, the frames are sturdy and designed to hold up to years of wear. Different materials will be right for different people and situations, according to Devin Harrison, MD, an ophthalmologist at Columbia River Eye Center in Richland, WA. Glass Magnifiers Came First but Had Some Downfalls. In addition, glass lenses are more harder and stronger, easy to scrub. Polycarbonate lenses are impact-resistant and used for safety eyewear, kids' and sports glasses. For instance, their Costa LightWAVE variety is even thinner and lighter than the most of the average polarized glasses. Trivex lenses are made from a urethane-based monomer. 1.67 vs 1.74 High Index Lenses – What You Need to Know. As visual acuity and personal taste the strongest prescription and only suitable for full rimmed glasses spectacles purchased. Has the greatest clarity the eyeglass store after all re not the thinnest kind lens! 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